They probably don't even know why :) Some machine learning decided to ban him.
Edit: "Abroad" relative to what though? If to Europe from US, there are other options than Uber. May vary depending on country. Bolt should be present here and there. The Lyft service that someone mentioned doesn't seem to be available in Europe.
Edit: "Abroad" relative to what though? If to Europe from US, there are other options than Uber. May vary depending on country. Bolt should be present here and there. The Lyft service that someone mentioned doesn't seem to be available in Europe.